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  • 20th IAEA Fusion Energy Conference
    (available on CD)
  • Introduction
  • Miscellaneous
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EX/7-4 · Stabilization of Neoclassical Tearing Mode by Electron Cyclotron Current Drive and Its Evolution Simulation on JT-60U Tokamak

K. Nagasaki1), A. Isayama2), N. Hayashi2), T. Ozeki2), M. Takechi2), N. Oyama2), S. Ide2), S. Yamamoto1), JT-60 Team

1) Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, Japan
2) Japan Atomic Energy Research Institute, Naka, Ibaraki, Japan

Abstract: Stabilization of an m=3/n=2 neoclassical tearing mode (NTM) by a local electron cyclotron current drive (ECCD) has been studied in JT-60U tokamak. In the stabilization experiment, the ECCD applied at the growth phase is found more effective than that at the saturation phase for the first time. The necessary power for the suppression is reduced and the mode onset is delayed. A numerical study has been made on the basis of the modified Rutherford equation coupled with the 1.5D transport code and the EC code. The simulation well reproduces the time evolution of the magnetic island at the growth and stabilizing phases. The peaked EC current profile with low intensity or the broad EC current profile with high intensity mitigates the sensitivity of the stabilization.

Keywords: electron cyclotron current drive, ELMy H mode, high beta, neoclassical tearing modes, tokamak,

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v.1.0 ( 23/1/05 )